The correct answers are The Nile is widely considered the longest river in the world, flowing into the Mediterranean Sea. and Lake Superior is the largest of the Great Lakes of North America.

Here is the breakdown for geographical features:

• Water: Use the for oceans, seas, and rivers (the Nile, the Mediterranean Sea), but use no article for individual lakes (Lake Superior).

• Mountains: Use the for mountain ranges (the Andes, the Himalayas), but use no article for single mountains (Mount Everest).

• Continents: Use no article for continents (North America, South America).